METHOD FOR TRANSMITTING DOWNLINK CONTROL INFORMATION

• US 20090225737A1
• Filed: 01/30/2009
• Published: 09/10/2009
• Est. Priority Date: 01/30/2008
• Status: Active Grant

• Current Assignee: Optis Cellular Technology LLC (Brevet Capital)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Ko, Hyun Soo, Seok, Ji Ae, Lee, Moon Il, Chung, Jae Hoon, Kim, So Yeon
• Granted Patent: US 7,835,337 B2
• Time in Patent Office: Days
• US Class Current: 370/342
• CPC Class Codes: H04L 1/06 using space diversity
• CPC Class Codes: H04L 1/1822 involving configuration of automatic repeat request [ARQ] with parallel processes
• CPC Class Codes: H04L 1/1893 Physical mapping arrangements physical resource mapping in general H04L5/00
• CPC Class Codes: H04L 1/1896 ARQ related signaling

Abstract

A method for efficiently transmitting downlink control information is described. A method for transmitting control information in a multiple antenna system which can simultaneously transmit a maximum of two codewords includes transmitting modulation and coding scheme (MCS) information, a new data indicator (NDI) and a redundancy version (RV) for information blocks transmitted through the two codewords, and transmitting additional control information including at least one of a swapping indicator and enable/disable information. The swapping indicator indicates whether or not swapping occurs between the information blocks transmitted through the two codewords, and the enable/disable information indicates whether or not any one of transmissions through the two codewords is disabled. The swapping indicator is reserved when any one of transmissions through the two codewords is disabled, thereby reducing signaling overhead and efficiently transmitting necessary information.

Claims

1. A method for transmitting control information in a multiple antenna system which can simultaneously transmit a maximum of two codewords, the method comprising:

transmitting modulation and coding scheme (MCS) information, a new data indicator (NDI) and a redundancy version (RV) for information blocks transmitted through the two codewords; and

transmitting additional control information including at least one of a swapping indicator and enable/disable information, the swapping indicator indicating whether or not swapping occurs between the information blocks transmitted through the two codewords, and the enable/disable information indicating whether or not any one of transmissions through the two codewords is disabled,

wherein the swapping indicator is reserved when any one of transmissions through the two codewords is disabled.

2. The method according to claim 1, wherein the additional control information indicates four states, the four states including:

a first state in which the information blocks transmitted through the two codewords are transmitted without swapping;

a second state in which the information blocks transmitted through the two codewords are transmitted with swapping; and

third and fourth states in which one of the information blocks transmitted through the two codewords is transmitted through one enabled codeword when any one of transmissions through the two codewords is disabled.

3. The method according to claim 1, wherein the swapping indicator is transmitted within downlink control information as one-bit explicit information, and

wherein the enable/disable information is implicitly transmitted to a receiving side by one or more combinations of the NDI, the RV, and the MCS information.

4. A method for receiving control information in a multiple antenna system which can simultaneously receive a maximum of two codewords, the method comprising:

receiving modulation and coding scheme (MCS) information, anew data indicator (NDI) and a redundancy version (RV) for information blocks transmitted through the two codewords; and

receiving additional control information including at least one of a swapping indicator and enable/disable information, the swapping indicator indicating whether or not swapping occurs between the information blocks transmitted through the two codewords, and the enable/disable information indicating whether or not any one of transmissions through the two codewords is disabled,

wherein the swapping indicator is reserved when any one of transmissions through the two codewords is disabled.

5. The method according to claim 4, wherein the additional control information indicates four states, the four states including:

a first state in which the information blocks transmitted through the two codewords are transmitted without swapping;

a second state in which the information blocks transmitted through the two codewords are transmitted with swapping; and

third and fourth states in which one of the information blocks transmitted through the two codewords is transmitted through one enabled codeword when any one of transmissions through the two codewords is disabled.

6. The method according to claim 4, wherein the swapping indicator is received within downlink control information as 1-bit explicit information, and

wherein the enable/disable information is implicitly acquired by a receiving side by one or more combinations of the NDI, the RV, and the MCS information.